New York rats carry some pretty scary diseases

Rats scurrying around Manhattan are reservoirs for a suite of germs, including E. coli and salmonella, new research has found. Some of the critters were even carrying Seoul hanta­virus, which can cause Ebolalike hemorrhagic fever and kidney failure in humans and has never before been documented in New York.

“Rats are sentinels for human disease,” W. Ian Lipkin, director of Columbia University’s Center for Infection and Immunity and senior author of the study, said in a statement. “They’re all over the city; uptown, downtown, underground. Everywhere they go, they collect microbes and amplify them. And because these animals live close to people, there is ample opportunity for exchange.” [10 Deadly Diseases That Hopped Across Species]

The scientists trapped 133 rats from five locations in Manhattan and took DNA samples from the rodents’ tissue, feces, urine and saliva. They found 15 of 20 of the bacterial and protozoan pathogens tested for, including E. coli, salmonella and Clostridium difficile — all of which can cause mild to life-threatening infections in people.

There isn’t much data to link rats to outbreaks of foodborne illness. But with about 2.1 million cases of such illness each year in the city, rats in homes and restaurants should probably be considered a risk factor for the transmission of gastrointestinal disease, the authors of the study wrote.

“New Yorkers are constantly exposed to rats and the pathogens they carry, perhaps more than any other animal,” Columbia research scientist Cadhla Firth, who led the study, said in a statement.

Live relatives of these dead rats pose health concerns in New York. (Craig Ruttle/Associated Press)

Seoul hantavirus, which is native to Korea and other parts of Asia, was found in samples from eight rats in the study. Humans who are infected with the virus may be asymptomatic, but there have been several cases of hemorrhagic fever with renal syndrome linked to Seoul hantavirus in Maryland and Los Angeles, the researchers noted. Genetic clues suggest the disease arrived in New York only recently.